Hey all, if interested in a background of what has been happening to this car since it won't fire up after replacing the opti, check this thread out:

http://web.camaross.com/forums/showthread.php?t=579402

I am trying to check to see if my plugs are firing. What I am doing is putting carb cleaner into the TB. When I do this while someone turns over the car, I find that the carb cleaner is blown out of the manifold with significant force.

It does not seem right to me that enough blowback is created by my cam. Could it be a jumped tooth or something?

Ben

 

You should not have ANY blow back. Either your cam or spark timing are off. If you want to check the plugs either do the "screw driver trick" or pull a plug connect the wire and let it lay on the engine while you crank it.

 

I confirmed spark at cylinder #1 only. It sparked. To dig into the others is godawful but will do it if necessary.

Should I take off my timing cover and check the teeth?

Is there any chance the opti is giving bad timing? Seems to me that would be odd for an opti to be doing. Replaced many opti's before and never had an issue with bad timing.

Even more, it would be odd if I jumped a tooth on my timing chain.

Really appreciate the input!

 

I haven't heard of LT1 having any timing chain problems. Hopefully someone else will post more on this. And I always go for the easy stuff first, which would be spark timing. Trouble is with blow back could also be valve train problems. Bent valves? That sort of thing.

 

It is very easy to put the Opti on incorrectly, not indexed to the correct hole in the back of the Opti. The cam dowel pin should only fit in the correct hole. Unfortunately, many people manage to get it in the wrong hole. The timing is now 120 cam-degrees (240 crank-degrees off) and the engine will not start and you get backfiring when the cylinders fire with the intake valves open.

http://shbox.com/1/opti_back.jpg

 

in my run ins with lt1's not starting and the use of any starting fluid the car has 70% of the time caught on fire..lol.. you need to be sure the battery has a good charge or its going to be a bitch to get it running.. it will pop and backfire all day and not start.. then after 17 hours of trying to start it, it will just start.. usually its something to do with the cold weather

 

Here I think is the answer?

This comes from yet another thread


I hope that answers the question